We look at the division of 313604 by 87 
Let's see how many times 87 fits into 313604.

On to step 1:
3 divided by 87 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 87

Advancing to step 2:
When dividing 31 by 87, we get 0 with a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 31 leaves us with 31.
Fetch the next digit (3) from the dividend, attach it to 31 and continue: 313 / 87

Moving on to step 3:
If we divide 313 by 87, we get 3 and a remainder of 52.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 52 after subtracting 261 from 313.
Include the next digit (6) from the dividend after 52, then repeat: 526 / 87

Step 4:
The number 87 fits into 526 6 times, leaving a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 36.0
Deduct 522 from 526 and we're left with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 87

Let's proceed to step 5:
The number 87 fits into 40 0 times, leaving a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 360.0
If we take 0 away from 40, we end up with 40.
Bring next digit (4) of the dividend behind the 40 and repeat the process: 404 / 87

Moving on to step 6:
The number 87 fits into 404 4 times, leaving a remainder of 56.
Record the quotient 4 as the next digit in the result. 
Result so far: 3604.0
If we subtract 348 from 404, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 7:
87 goes into 560 6 times with a remainder of 38.
Record the quotient 6 as the next digit in the result. 
Result so far: 3604.6
The remainder is 38 after subtracting 522 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 8:
380 divided by 87 is 4 with a remainder of 32.
The next digit of our result is 4. 
Result so far: 3604.64
Deduct 348 from 380 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 9:
320 divided by 87 is 3 with a remainder of 59.
Use 3 as the next digit of our solution. 
Result so far: 3604.643
Subtracting 261 from 320 leaves us with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Step 10:
If we divide 590 by 87, we get 6 and a remainder of 68.
Use 6 as the next digit of our solution. 
Result so far: 3604.6436
Subtracting 522 from 590 leaves us with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Moving on to step 11:
87 goes into 680 7 times with a remainder of 71.
Record the quotient 7 as the next digit in the result. 
Result so far: 3604.64367
Deduct 609 from 680 and we're left with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 12:
When dividing 710 by 87, we get 8 with a remainder of 14.
Write down 8 as next digit of the result. 
Result so far: 3604.643678
If we take 696 away from 710, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 13:
The number 87 fits into 140 1 times, leaving a remainder of 53.
Put 1 as the next digit of the answer. 
Result so far: 3604.6436781
If we subtract 87 from 140, we get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Moving on to step 14:
87 can be fit into 530 6 times, resulting in a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 3604.64367816
Deduct 522 from 530 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 3604.64367816, with a leftover of 8e-09.